Furnace



Jan. 10, 1933.

FURN

Filed Dec. 22. 1930 H. C. JURS AGE 3 Sheets-Sheet H. c. JURS Jan. l0,1933..

FURNACE 1930 3 Sheets- Sheet Filed Dec 22.

L Jn

INVENTOR H. C. JUS

Jah. 10, 1933.

FURNACE Filed Dec. 22.l

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Patented idan. 10, 1933 fr:- Y e. runs, or staunen, on'ro rnnnaonApplication filed necember 22, 193).l Serialkto. 503,90?.

The present invention relates broadly to furnace structures, and moreparticularly to mue furnaces of the type especially adapted forenameling processes.

f ln the art of euameling, itis essential that the combustion gases bemaintained outl or" contact with the articles being enameled, for thereason that contacto such gases with the enamel coating -objectionablydiscolors .the same. The diculties o satisfactorily operating combustionfurnaces has led to attempts to substitute electrically heated furn`naces in which the problem of discoloring gases does not exist. milesuch furnaces have satisfactorily performed their intended duty, theyhave been open to the objection of extremely hi h cost of operation. pllt is one of t e objects o' the present invention to provide a furnaceof improved 2@ construction eective for 'maintaining kthe combustiongases out of contact with the enameled articles. ltis also one ot theobjects or the invention to provide a furnace ot such improvedconstruction that more ecient heating and therefore a lower fuelconsumption is obtained.

ln the accompanying drawings l have shown for purposes ot illustrationonly, a preferred embodiment 3@ the drawings:

Figure 1 is a horizontal longitudinal sectional vievv'throu h a furnaceconstructed in accordance with t e present invention;

Figure 2 is a transverse sectional view on l @t the une n n of. Figurei, looking in the direction of the arrows; and

Figure 3 is a vertical longitudinal sectional A View on the line III-IH'oFigure 2, looking in the direction ofthe arrows. l

In accordance with the present invention there is provided a suitable,base 2 of concrete Y or similar material from which-side walls 3 and 4,and end walls 5 and 6 extend upwardly to, thev desired height. The sidewalls 4and the end walls 6 are preferably solidly built up of lirebrick, and being enclosed by thev air sealed insulating Vside walls 3and end walls 5, constitute an outer furnace shell free' lfrom sprungarches, as hereinafter pbinted oi the invention. ln

out, and form a rigid insulated chamber within which the mue proper isconstructed.

Formed in the lire brick bottom 2 is a combustion chamber Qfwithin whichis mounted a series oi piers 10 of suitable size, hei ht and 55 numberfor supporting a refractory oor 11. This Hoor is herein illustrated ascomprising a series of individual sections'having inter fitting joints12 to insure a substantially tight door such as to prevent the dow ofcombus- 50 tion gases from the combustion chamber 9 into the tiringchamber 8.

YExtending through the walls at suitable points are burner openings 14adapted to lsupply the gas or oil or'combustion pur- 65 muiiies isherein illust-rated as comprising a plurality of suitably superimposedsections, all oii the'sections' being located physically within the ringchamber and spaced from the walls thereofso as to provide a free ra- 8@diating surface entirely therearound. At their upper ends they underlieand support a suitable refractory structure 16, preferably offire-brick, having formed therein a horizon"- tal flue 17 which, asillustrated in Figure 3 of 85 the drawings, communicates at one endvwith.

a stack opening 18'. ,l 1

` The refractory structure 16 being carried directly by the upper endsof the muiiies 15,

is free to Vmove up or down vthereon and there- 'byffollow dimensionalchanges in the length of the inutiles-caused by heating and coolingthereof,'while alwa sretaining an operative relationship therewith. Thebottom Wall of the refractory structure 16 is formed-with a 95 series ofVopenings 19., each of which` is'in'substanti'al alignment :with one ofthe mui'es so as to permit the same to freely discharge into thehorizontal flue 17.

At one side, thevv refractory structure 16 10 bears against one of theside walls 4: whereby it is guided during its vertical movements. At itsupper portion a fire briclr section protected by insulating brick 21stops loss of heat from' the due structure 16, thereby maintaining auniformly heated tiring structure, and preventing contraction andsubsequent cracking due to non-uniform ternperature conditions.

Extending between the refractory struc tures 16 is a roof 22 comprisinga plurality of individual refractory tiles or blocks of the generalconstruction illustrated in Figure 3 of the drawings. From this figureit will be apparentthat alternate transverse rows the refractory blocksare formed with supporting shoulders 23 and suspending projections 24.These suspending projections may be engaged between channels 25 suitablysecured to longitudinally extending beams 26 carried at one end by atransverse support 27 bearing at its ends on the walls 3 and 4c formingthe outer shell of the furnace, and at its opposite end directly in theend shell. These channels serve in turn to support the alternate rows ofblocks. The intermediate rows are formed with ribs or flanges 28 adaptedto engage the shoulders 23 on which they are supported. It is thuspossible to provide a flat top type arch eliminating the difficulties ofusual sprung arch construction, and consequently the troubles inherentinthe satisfactory maintenance of such types of roofs.

' Within the" ring chamber the bottom 11 may carry a seriesofarticlesupports 29 on which theenameled articles rest during the ringoperation.

`From the foregoing construction it will be apparent that I haveprovided a muifle type furnace in which the mules 'are physicallylocated within the firing chamber so as to 1ncrease the radiatingsurface andconsequently the efficiency of the' furnace structure. Thesemules are in turn effectively insulated to cut down heat losses, and areprevented from discharging their contents into the firing chamber byreason of the refractory structures 16 which are carried thereby in afloating relationship so as to always maintain the desired gas conductinrelationship therewith. To those skilled 1n theart it will be apparentthat the buck stays 30, illustrated more particularly in Figure 1, whichmay in turn be Stayed or tied together in any usual manner, areeffective for reinforcing the entire furnace structure. If desired, alight metal casing 31 may be provided intermediate the buck staysand theWalls 3- and '5 for further insulating and reinforcing the furnaceshell.

The provision of the flat roof intermediate the refractory structuresand suspended from the shell of the furnace also constitutes anadforming a firing v forming the top of sald chamber, a combusinventionand serves to satisfactorily confine the refractory structures 16 duringtheir vertical movements.

While I have herein illustrated and described a preferred embodiment ofmy invention, it will be understood that the drawings are illustrativeonly and that changes in the construction, operation and contour of theparts may be made without departing either from the spirit of myinvention or the scope of my broader claims.

I claim:

l. In a furnace of the inutile type, a series of walls defining a tiringchamber, a flat type roof forming the fop of said chamber, a floatingfine structure intermediate saidi'oof and walls, and inutilescarryingsaid flue structure.

In a furnace of the mulfle type, walls defining a firing chamber, aseries of muiles within said chamber and spaced from said walls, and afloating flue structure-carried by said mufiles and into which themufiles of the series open.

3. In a furnace of the mulile type, walls forming a firing chamber, acombustion chamber below said firing chamber, a gastight floorintermediate said chambers, muliles Within the firing chambercommunicating at their lowerends with the combustion chamber, and afloatin flue structure carried by said muliles at -t eir upper ends andinto which said muiiles open.

4. In a furnace of the mullie type, Walls forming a firing chamber, aflat type roof forming the top of said chamber, a combustion chamberbelow said firing chamber, a gas-tight iioor intermediate said chambers,muiles Within the firing chamber communieating at their lower ends withthe combustion chamber, and a floating flue structure carried by saidmufles at their upper ends, and intol which the mules open.

5. In a furnace of the Inutile type, walls forming 'a firing chamber, acombustion chamber separate from said tirin chamber, a gas-tightpartition separating said chambers, mufles within the firing chamberscommunicating at one end with the combustion chamber, a floating fluestructure carried by sald muiesyat their ends opposite the combustionchamber, said flue structure having openings therein communicating withthe adjacent ends of the muies. y

6. In a furnace of the mule type, walls chamber, a flat type roof tionchamber separate from said firing chamber, mules within the firinOchamber communicating at the lower ends with the combustion chamber,anda .floating flue struc-rr ture intermediate said roof and wallscarried by said mules at their upper end, said flue structurehavingopenings therein communieating withthe openings in the upper ends of themules.

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A25 at their upper ends, said iue structure having 7.Inamuietefurnace,achamber having op osite sie walls, a roof structure interposedetween the side walls and spaced therefrom, a iue in the space betweenthe top `and side wallsv and servin to closesuch space, and a pluralityof m es provldmg columns for supporting ysaid iue mdepend- Y Y' ently ofthe topand side walls.

8. In a muilie t pe furnace, a chamber having opposite side walls, aroof structure interposed between the side walls and spaced therefrom, aflue in the space between the top and side walls and serving to closesuch space, and a plurality of muiiies providing columns for supportingsaid fiue independently of the top and side walls, said chamber having abottom and a combustion chamber` below the bottom communicating withsaid mulies.-

9. In a furnace of the muiile #ty a bottom 2o combustion chamber, aseries o mufiies ex- 4 tending vertically and all communicating at o neend with said vcombustion'chamber, a flue structure common to aplurality of said muies and directly supported by the mules a pluralityof openings into and throu which saidlmuiiies dischar e, and a stackinto which said flue structure ischarges adjacent' the upper portion ofthe furnace.

In testimonyV whereof I have hereunto se my hand.

v HENRY C. JOBS.4

